Pulse or digital communications – Repeaters – Testing
Patent
1995-02-08
1996-09-17
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375214, 370 131, 370 14, H04B 1702
Patent
active
055576338
ABSTRACT:
A discrete integrated repeater device and port MAU/AUI functions shares resources among its several ports. The device includes a single multi-bit free running counter providing preselected timing intervals to a plurality of latches. A signal undergoing measurement clears the latch while a preselected timing signal sets the latch. Receipt of a timing signal at a set latch indicates success or failure of some particular condition under test. The device satisfies an IEEE 802.3 specification for execution of a link integrity test. The device is also able to selectively disable or enable the link integrity test function for particular ports. A plurality of latches, one associated with each port, is set upon carrier sense detection at the particular port. A token passing mechanism implemented with a daisy chained line coupled to each latch enables a polling of each latch to provide carrier sense information about each port in a serial format. The device shares a single PLL among all its ports by producing a logical sum of carrier sense inputs to enable activation of the PLL. A collision indication signal will override operation of the PLL to ensure data integrity and to allow the PLL to reacquire lock on its reference clock.
REFERENCES:
patent: 4903321 (1990-02-01), Hall et al.
patent: 5119398 (1992-06-01), Webber, Jr.
patent: 5187807 (1993-02-01), Alard et al.
Staab David
Vijeh Nader
Advanced Micro Devices , Inc.
Chin Stephen
May Timothy J.
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